//用户输入整数n，计算1!+(1!+2!)+(1!+2!+3!)+…..+(1!+2!+…n!)
 //       用方法实现
   //     有参数有返回值
package production.com.company;

import java.util.Scanner;

public class 第四题2 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入整数n: ");
        int n = scanner.nextInt();
        System.out.println(jc(n));
    }
    public static int jc(int n) {
        int sum=1;
        if (n<0){
            System.out.println("输入错误");
        }else if (n==0||n==1){
            System.out.println(n+"的阶层为1");
        }else {
            for (int i = 1; i <=n ; i++) {
                sum*=i;
            }
            return sum;
            }
        return sum;
        }
    }